Telephone-exchange system.



J. L. WRIGHI.

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TELEPHONE EXCHANGE SYSTEM;

APPLICATION mm MAY 1. m3.

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TELEPHONE EXCHANGE SYSTEM.

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MN km ik QGQ O-lllllll O I 0 O O M O UNITED STATES. PATENT. OFFICE.

JOSEPH L. WEIGHT. OF CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO JAMES B. GARFIELD, TRUSTEE, OF CLEVELAND, OHIO.

TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Apr. 1,' 1919.

Application filed May 7, 1913. Serial No. 766,096.

To l/l w/mm it may concerh:

Fv it known that I, Josnrn L. Wluclrr, a citizen of the I'nitcd. States, residing at (.leveland. in the eouutynf Cuyahoga and State of Ohio, have invented a certain new and useful Improvementin Telephone-EX- ehange Systems, of which the following is a full. clear. concise, and exact description,

reference. being had to the accompanying.

drawings. forming a part of this specification.

My in rcntion relates to telephone exchange systems. and particularly to that class known as semi-automatic. In systems of this char acter the lines of calling subscribers are antomatically connected to an operators position.. This position is provided with a suitable sending dcvicirsfor controlling the action of the automatic switches for extending the calling line to the line oithc called subscriber.

Instead of using automatic switches to connect the. calling lines to the operators positions. 1 use'a combination of relays. These relays are formed into soups, there being what may be termed a t of tone and a set of units relays in each group. The

tens and units nclaysin acting form certain combinations. sii ch. combinations connecting the calling lines to the operators ositions. The method offerming cross coin inations between a set o f-tens and units relays is disclosed in l' ctters rarest 939,186, E. E. Clement. November 2d, 1909. In the present system however. this plan is enlar ed upon and these tens and units relays e ect connections in the following manner:

1st. By means of a set-of tens and units relays the calling line is connected by primary selectitha, to what is termed a primary trunk. Each primary trunk terminates in a first selector switch.

2d. The primary trunk is connected by a secondary selection by means of a set of tons and units relays to what is termed a socondary trunk. F

3d. The'secondary trunk by a third or tertiary selection by means of a set of tens and units relays is connected to an operators position.

The operators position in the present instance is equipped with a keyboard by which the automatic switches are controlled soas to efi'ectsconnectious between calling and called subscribers.

After the connection has been established, theaplniratus used in the secondary and tcitiary selection is automatically disconnected from the primary trunk and is in condition to be operated by other calls.

With this method of selection which might properly be called universal selection it is possible to connect any calling line to any 0])(5I't1t01"s position. At night or during slack hours all calls can be handled from one position regardless of the size of the exchange.

Some of the novel features in this system in addition to the method of using and controlling sets of tcnsand units relays are as follows:

The sending device which controls the ac tion of automatic switches:

The method of automatically ringing in the connector circuit:

Emergency switches used in conjunction with the primary, secondary and tertiary selections so as to guard or protect the apparatus used case of faulty connections.

/ My invention i illustratedfin the accompanying drawings, wherein:

Figure 1 shows a group of subscribers line circuits and a. series of tens and units primary relays for connecting the lines to primary trunks.

Fig. 2 shows a primary trunk with its associated first selector switch.

Fig. 3 shows a seco 1d selector switch.

Fig. 4 shows a co ncctor circuit with its associated switch for selective ringing.

Fig. 5 is a duplication of Fig. 1 and represents the called subscribers line equip meats.

Fig. 6 shows a set of relays and switches for controlling the primary relays and a trunk to the tertiary trunk with which is associated an operators key-board and sendin device.

Fig. 11" is a modification of Fig. 11.

Fig. 12 shows a tertia trunk for con trolling the operation of tie key-board and sending device.

Fig. 12 is a modification of- Fig. 12.

Fig. .18 shows an operators key-board and t0 sendmg device.

Fig. '14 shows One arrangement or plan of rlma ig. 15 hows the arrangement of the various shedts in accordance with the plan shown in Fig. 14.

Fig. 16 shows another plan of primary, second and tertiary selection.

Fig. 1 shows the arrangement of the various sheetsin accordance with the plan shown in Fig. 16.

ferri'lg to Fig. 1, the subscribers stations shown at A, A, A, A and A are equipped with apparatus usual in common battery stations. Each line is provided with 11 individual line and cut-off relay.

In t e present arrangement, I have shown lines to be numbered 21, 31, 32 and 42, so as to show how various combinations of lines can become connected to primary trunks through the same set of relays b having the relays themselves in acting per )rm certain cross combinations.

For each group of one hundred lines, where ten per cent. trunking is used, the will be ten tens relays and ten units relays for each primary trunk. The tens relays are numbered from 1 to 10. while the units relays are numbered from 11 i020.

Each one of this tens relays of a set conlf tains the terminals of ten lines, so it there- Y? fore follows that ten relays will care for one hundred lines. For each additional primary trunk,'there will be another set of tens and units relays and in case ten primary trunks are provided, the subscribers lines Will be multiplcd ten times.

Corresponding contacts in the tens relays of a certain set are multipled and connected to contacts in the units relays of the same set in the following manner: The multiples of. number one set of contacts of the tens relays are connected to contacts in the first units relay while the multiple contacts of the second set of contacts in the tens relays are connected to the contacts in the second uni s relay.

en the first tens relay and the first units relay of one set is energized, it naturally follows that the line connected to the first set of contacts in the first tens relay islconnected to contacts in the first units re a T e contacts in the units relays which engage contacts leading to the multiple con- IF-nections in the tens relaysmrc connected secondary and tertiary selection.

directly to wires leading to primary trunks. These primary trunk wires are multipled to the contacts 111 each units 'relay of its set. When the first tens and the first units rclaysare energized, it therefore follows that the line connected to the first set of contacts in the first tens relay is connected to a primary trunk.

i If the subscriber whose line is number 31 should originate a call, the action of his line relay through the control circuit would onergize tens relay 2 and units relay 11, there- 'by connecting his line to the primary trunk.

Subscriber 32 originating a call would cause tens relay 2 to become energized and the units relay 12, thereby connecting his line to the primary trunk.

It isonly possi l e for one tens and one units relayin a certain set to become energized at" the same time. \Vhen a tens and units role of the re eye of a set are prevented from operating and the control circuit is shifted. to the next set of tons and units relays to place them in operative condition.

Referring to Fig. 6 group of relays for controllin the action of the tens and units relaysiin l ig. 1 is provided to prevent inter fereti 'e" in case of sinmltancous calls from the Same group of line relays. If some provision were not made then in case of such calls. more than one tens and one units relay could become energized in the same primary set.

Relay 382 is individual to a primary trunk, while the rest of the relays shown in this figure are common to a group of one hundred lines. There will be ten relays 321 to 330, ten relays 331 to 340 and ten relays 341 to 350. Each of the relays 32 to 330 is individuahto a group of ten line relays, while a set of'relays 331 to 340 are controlled by the set of relays 321 to 330. Relay 321 controls relay 331, and relay 322 controls relay 332, etc. Each relay in the set 331 to 340 is provided with eleven sets of contacts in order to enable a tens relay in the primary set to be operated, and also to allow any one of the ten units relays in the primary set to become operated. The contacts of relays 321 to 330 which operate their respective relays 331 to 340 are arranged in a series relation so that only one of the relays 331 to 340 can be operated at the same time.

The tens starting wire belonging to a group of ten line relays is multipled while the units wire of each line relay is individual and connected in groups t0.,their respective control relays 331, 332, 333, etc, as the case may be.

For each group of ten line relays, the tens wire will be multipled, enabling any relay of the ten when operated to close the circuit of its control relay in the set 321 to 330.

of a set are energized, the rest 

